Distribution and mixing of old and new nonstructural carbon in two temperate trees

© 2015 The Authors. New Phytologist © 2015 New Phytologist Trust.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1990. - 206(2015), 2 vom: 27. Apr., Seite 590-7
1. Verfasser: Richardson, Andrew D (VerfasserIn)
Weitere Verfasser: Carbone, Mariah S, Huggett, Brett A, Furze, Morgan E, Czimczik, Claudia I, Walker, Jennifer C, Xu, Xiaomei, Schaberg, Paul G, Murakami, Paula
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2015
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, U.S. Gov't, P.H.S. Harvard Forest carbohydrates carbon allocation radiocarbon (14C) storage tree rings wood Carbon Radioisotopes mehr... Carbon 7440-44-0 Starch 9005-25-8
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520 |a We know surprisingly little about whole-tree nonstructural carbon (NSC; primarily sugars and starch) budgets. Even less well understood is the mixing between recent photosynthetic assimilates (new NSC) and previously stored reserves. And, NSC turnover times are poorly constrained. We characterized the distribution of NSC in the stemwood, branches, and roots of two temperate trees, and we used the continuous label offered by the radiocarbon (carbon-14, (14) C) bomb spike to estimate the mean age of NSC in different tissues. NSC in branches and the outermost stemwood growth rings had the (14) C signature of the current growing season. However, NSC in older aboveground and belowground tissues was enriched in (14) C, indicating that it was produced from older assimilates. Radial patterns of (14) C in stemwood NSC showed strong mixing of NSC across the youngest growth rings, with limited 'mixing in' of younger NSC to older rings. Sugars in the outermost five growth rings, accounting for two-thirds of the stemwood pool, had a mean age < 1 yr, whereas sugars in older growth rings had a mean age > 5 yr. Our results are thus consistent with a previously-hypothesized two-pool ('fast' and 'slow' cycling NSC) model structure. These pools appear to be physically distinct 
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650 4 |a Harvard Forest 
650 4 |a carbohydrates 
650 4 |a carbon allocation 
650 4 |a radiocarbon (14C) 
650 4 |a storage 
650 4 |a tree rings 
650 4 |a wood 
650 7 |a Carbon Radioisotopes  |2 NLM 
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650 7 |a Starch  |2 NLM 
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700 1 |a Carbone, Mariah S  |e verfasserin  |4 aut 
700 1 |a Huggett, Brett A  |e verfasserin  |4 aut 
700 1 |a Furze, Morgan E  |e verfasserin  |4 aut 
700 1 |a Czimczik, Claudia I  |e verfasserin  |4 aut 
700 1 |a Walker, Jennifer C  |e verfasserin  |4 aut 
700 1 |a Xu, Xiaomei  |e verfasserin  |4 aut 
700 1 |a Schaberg, Paul G  |e verfasserin  |4 aut 
700 1 |a Murakami, Paula  |e verfasserin  |4 aut 
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